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diff --git a/archived/projt-launcher/launcher/minecraft/auth/AuthFlow.hpp b/archived/projt-launcher/launcher/minecraft/auth/AuthFlow.hpp
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+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 Project Tick
+// SPDX-FileContributor: Project Tick Team
+/*
+ *  ProjT Launcher - Minecraft Launcher
+ *  Copyright (C) 2026 Project Tick
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include <QList>
+#include <QNetworkReply>
+#include <QObject>
+#include <QUrl>
+
+#include "minecraft/auth/AccountData.hpp"
+#include "minecraft/auth/steps/Step.hpp"
+#include "minecraft/auth/steps/Credentials.hpp"
+#include "tasks/Task.h"
+
+class AuthFlow : public Task
+{
+	Q_OBJECT
+
+  public:
+	/**
+	 * Authentication action to perform.
+	 */
+	enum class Action
+	{
+		Refresh,   ///< Silent token refresh
+		Login,	   ///< Interactive browser login
+		DeviceCode ///< Device code flow
+	};
+
+	explicit AuthFlow(AccountData* data, Action action = Action::Refresh);
+	~AuthFlow() override = default;
+
+	void executeTask() override;
+
+	[[nodiscard]] AccountTaskState taskState() const noexcept
+	{
+		return m_taskState;
+	}
+
+  public slots:
+	bool abort() override;
+
+  signals:
+	/**
+	 * Emitted when browser authorization is required.
+	 */
+	void authorizeWithBrowser(const QUrl& url);
+
+	/**
+	 * Emitted when device code authorization is required.
+	 */
+	void authorizeWithBrowserWithExtra(QString url, QString code, int expiresIn);
+
+  private slots:
+	void onStepCompleted(projt::minecraft::auth::StepResult result, QString message);
+
+  private:
+	/**
+	 * Build the authentication pipeline based on account type and action.
+	 * @return true if pipeline was successfully built, false on configuration error
+	 */
+	[[nodiscard]] bool buildPipeline(Action action);
+
+	void executeNextStep();
+	void succeed();
+	void failWithState(AccountTaskState state, const QString& reason);
+	bool updateState(AccountTaskState newState, const QString& reason = QString());
+
+	// Convert new StepResult to intermediate flow state (not final AccountTaskState)
+	[[nodiscard]] static AccountTaskState stepResultToFlowState(projt::minecraft::auth::StepResult result) noexcept;
+
+	// Convert new TokenValidity to legacy Validity
+	[[nodiscard]] static Validity toValidity(projt::minecraft::auth::TokenValidity validity) noexcept;
+
+	AccountTaskState m_taskState = AccountTaskState::STATE_CREATED;
+	QList<projt::minecraft::auth::Step::Ptr> m_steps;
+	projt::minecraft::auth::Step::Ptr m_currentStep;
+
+	// Flow control
+	bool m_aborted		 = false;
+	bool m_pipelineValid = false;
+
+	// Legacy AccountData for compatibility with existing consumers
+	AccountData* m_legacyData = nullptr;
+
+	// New credentials structure (populated during auth, synced to legacy at end)
+	projt::minecraft::auth::Credentials m_credentials;
+};